Docker default version is now 20.10

README.md

@@ -132,7 +132,7 @@ Note: Upstart/SysV init based OS types are not supported.
 - Core
   - [kubernetes](https://github.com/kubernetes/kubernetes) v1.21.1
   - [etcd](https://github.com/coreos/etcd) v3.4.13
-  - [docker](https://www.docker.com/) v19.03 (see note)
+  - [docker](https://www.docker.com/) v20.10 (see note)
   - [containerd](https://containerd.io/) v1.4.4
   - [cri-o](http://cri-o.io/) v1.21 (experimental: see [CRI-O Note](docs/cri-o.md). Only on fedora, ubuntu and centos based OS)
 - Network Plugin
@@ -156,7 +156,7 @@ Note: Upstart/SysV init based OS types are not supported.
 
 ## Container Runtime Notes
 
-- The list of available docker version is 18.09, 19.03 and 20.10. The recommended docker version is 19.03. The kubelet might break on docker's non-standard version numbering (it no longer uses semantic versioning). To ensure auto-updates don't break your cluster look into e.g. yum versionlock plugin or apt pin).
+- The list of available docker version is 18.09, 19.03 and 20.10. The recommended docker version is 20.10. The kubelet might break on docker's non-standard version numbering (it no longer uses semantic versioning). To ensure auto-updates don't break your cluster look into e.g. yum versionlock plugin or apt pin).
 - The cri-o version should be aligned with the respective kubernetes version (i.e. kube_version=1.20.x, crio_version=1.20)
 
 ## Requirements

roles/container-engine/docker/defaults/main.yml

 ---
-docker_version: '19.03'
+docker_version: '20.10'
 docker_cli_version: "{{ docker_version }}"
 
 docker_package_info:

tests/files/packet_debian9-calico-upgrade.yml

@@ -7,3 +7,6 @@ mode: default
 kube_network_plugin: calico
 deploy_netchecker: true
 dns_min_replicas: 1
+
+# Only docker package 19.03 for Debian9
+docker_version: '19.03'

tests/files/packet_fedora33-calico.yml

@@ -8,7 +8,4 @@ deploy_netchecker: true
 dns_min_replicas: 1
 kube_network_plugin: calico
 
-# Only docker package 20.10 for Fedora33
-docker_version: '20.10'
-
 auto_renew_certificates: true